MoneySupermarket has calculated the costs Batman needs to take into account when using or changing his equipment. Total cost is over $682 millions so you now see why only one of the Gotham’s most reachest guys had to be Batman.
The Tumbler would cost an impressive $18 million and the costume would cost about $1.1 million. So, if you want to be Batman, you may need to stay in a long line once a year to get some big discounts for that equipment. Anyways, fun is and fun will be with Batman.